How does increasing the concentration of one of the reactants affect the reaction? a) it slows down the reaction by making the reaction unbalanced.

b) it speeds up the reaction by acting as a catalyst.

c) it speeds up the reaction by supplying more particles to react.

d) it speeds up the reaction by supply more activation energy

the answer is d   for sure : )

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.

it was spontaneous.

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